<template>
  <div>
    这个是sync---父组件---{{ num }}---{{ num2 }}
    <hr>
    <Son
      :aa="num"
      :bb="num2"
      @update:aa="val => num=val"
      @update:bb="val=>num2=val"
    />
    <hr>
    <Son
      :aa.sync="num"
      :bb.sync="num2"
    />
  </div>

</template>

<script>
import son from './son.vue'
export default {

  components: {
    son
  },
  data() {
    return {
      num: 100,
      num2: 200
    }
  },

  mounted() {

  },

  methods: {

  }
}
</script>

<style lang="scss" scoped>

</style>
